Vmarg

Closed Loop

Margining

UCD90124

VMON

GPIO

12V

GPIO

3.3V OUT

VMON

1.8V OUT

3.3V_UCD

0.8V OUT

I0.8V

TEMP0.8V

VMON

VMON

VMON

VMON

I12V

TEMP12V

VMON

VMON

INA196

12V

12V OUT

3.3V OUT

12V OUT

1.8V OUT

GPIO

GPIO

0.8V OUT

PWM

2MHz

INA196

I0.8V

WDI from main

processor

GPIO

WDO

GPIO

/MR

VMON

TEMP IC

TEMP0.8V

TEMP IC

TEMP12V

POWER_GOOD

GPIO

WARN_OC_0.8V_

OR_12V

GPIO

SYSTEM RESET

GPIO

OTHER

SEQUENCER DONE

(CASCADE INPUT)

GPIO

I2C/

PMBUS

JTAG

/EN

DC-DC 1

VOUT

VFB

VIN

/EN

LDO1

VOUT

VIN

/EN

DC-DC 2

VOUT

VFB

VIN

V

4- wire Fan

12 V

4-

DC Fan

PWM

GPIO

Fan Tach

25 kHz Fan PWM

12V

TACH

PWM

GND

5.1V

UCD90124

www.ti.com

SLVSA29A – NOVEMBER 2009 – REVISED DECEMBER 2009

12-Rail Sequencer and System Health Monitor With Fan Control

Check for Samples :UCD90124

1

FEATURES

DESCRIPTION

2

•

Monitor and Sequence 12 Voltage Rails

–

All Rails Sampled Every 400

μs

power-supply

sequencer

and

system-health

–

monitor. The device integrates a 12-bit ADC for

–

Sequence Based on Time, Rail and Pin

monitoring up to 13 power-supply voltage, current, or

Dependencies

temperature inputs. Twenty-six GPIO pins can be

–

Four Programmable Undervoltage and

used for power supply enables, power-on reset

signals,

external

interrupts,

cascading,

or

other

Overvoltage Thresholds per Monitor

system functions. Twelve of these pins offer PWM

•

Fan Control and Monitoring

functionality. Using these pins, the UCD90124 offers

–

Supports Four Fans With Five User-Defined

support

for

fan

control,

margining,

and

Speed-vs-Temperature Setpoints

general-purpose PWM functions.

–

Supports Two-, Three-, and Four-Wire Fans

Fan-control

signals

can

be

sent

using

PMBus

•

Nonvolatile Error and Peak-Value Logging per

commands or generated from one of two built-in

Monitor (up to 12 Faults)

fan-control algorithms. PWM outputs combined with

temperature and fan-speed measurements provide a

•

Closed-Loop Margining for 10 Rails

complete

fan-control

solution

for

up

to

four

–

Margin Output Adjusts Rail Voltage to

independent fans.

Match User-Defined Margin Thresholds

The TI Fusion Digital Power™ designer software is

•

Programmable Watchdog Timer and System

provided for device configuration. This PC-based

Reset

graphical user interface (GUI) offers an intuitive

•

Flexible Digital I/O Configuration

interface for configuring, storing, and monitoring all

system operating parameters.

•

Multiphase PWM Clock Generator

–

Clock Frequencies From 15.259 kHz to 125

MHz

–

Capability to Configure Independent Clock

Outputs for Synchronizing Switch-Mode

Power Supplies

•

Internal Temperature Sensor

•

APPLICATIONS

•

Industrial / ATE

•

Telecommunications and Networking

Equipment

•

Servers and Storage Systems

•

Embedded Computing

•

Any System Requiring Sequencing and

Monitoring of Multiple Power Rails

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

PMBus, Fusion Digital Power are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2009, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.